| |bgcolor="LemonChiffon"|<nowiki>"</nowiki>'''1.''' It is reasonable to recommend an ICD for patients with HCM with:<nowiki>"</nowiki><br>'''a.''' Sudden death presumably caused by HCM in 1 or more first-degree relatives<ref name="pmid21059440">{{cite journal |author=Bos JM, Maron BJ, Ackerman MJ, ''et al.'' |title=Role of family history of sudden death in risk stratification and prevention of sudden death with implantable defibrillators in hypertrophic cardiomyopathy |journal=Am. J. Cardiol. |volume=106 |issue=10 |pages=1481–6 |year=2010 |month=November |pmid=21059440 |doi=10.1016/j.amjcard.2010.06.077 |url=}}</ref>. ''([[ACC AHA guidelines classification scheme#Level of Evidence|Level of Evidence: C]])'' <nowiki>"</nowiki><br>'''b.''' A maximum LV wall thickness greater than or equal to 30 mm<ref name="pmid11127463">{{cite journal |author=Elliott PM, Poloniecki J, Dickie S, ''et al.'' |title=Sudden death in hypertrophic cardiomyopathy: identification of high risk patients |journal=J. Am. Coll. Cardiol. |volume=36 |issue=7 |pages=2212–8 |year=2000 |month=December |pmid=11127463 |doi= |url=}}</ref><ref name="pmid11273061">{{cite journal |author=Elliott PM, Gimeno Blanes JR, Mahon NG, Poloniecki JD, McKenna WJ |title=Relation between severity of left-ventricular hypertrophy and prognosis in patients with hypertrophic cardiomyopathy |journal=Lancet |volume=357 |issue=9254 |pages=420–4 |year=2001 |month=February |pmid=11273061 |doi=10.1016/S0140-6736(00)04005-8 |url=}}</ref><ref name="pmid16762758">{{cite journal |author=Sorajja P, Nishimura RA, Ommen SR, Ackerman MJ, Tajik AJ, Gersh BJ |title=Use of echocardiography in patients with hypertrophic cardiomyopathy: clinical implications of massive hypertrophy |journal=J Am Soc Echocardiogr |volume=19 |issue=6 |pages=788–95 |year=2006 |month=June |pmid=16762758 |doi=10.1016/j.echo.2006.01.005 |url=}}</ref><ref name="pmid10853000">{{cite journal |author=Spirito P, Bellone P, Harris KM, Bernabo P, Bruzzi P, Maron BJ |title=Magnitude of left ventricular hypertrophy and risk of sudden death in hypertrophic cardiomyopathy |journal=N. Engl. J. Med. |volume=342 |issue=24 |pages=1778–85 |year=2000 |month=June |pmid=10853000 |doi=10.1056/NEJM200006153422403 |url=}}</ref>. ''([[ACC AHA guidelines classification scheme#Level of Evidence|Level of Evidence: C]])'' <nowiki>"</nowiki><br>'''c.''' One or more recent, unexplained syncopal episodes<ref name="pmid19307481">{{cite journal |author=Spirito P, Autore C, Rapezzi C, ''et al.'' |title=Syncope and risk of sudden death in hypertrophic cardiomyopathy |journal=Circulation |volume=119 |issue=13 |pages=1703–10 |year=2009 |month=April |pmid=19307481 |doi=10.1161/CIRCULATIONAHA.108.798314 |url=}}</ref>. ''([[ACC AHA guidelines classification scheme#Level of Evidence|Level of Evidence: C]])'' <nowiki>"</nowiki>
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